Mont-Saint-Aignan weather in August

In August, Mont-Saint-Aignan sees average daytime highs of 22°C and overnight lows near 13°C, with 65 mm of rain across 10.7 wet days and about 14.2 hours of daylight. It is the 2nd-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 21°C by the end. The sky is clear or mostly clear about 20% of the time in August, and the air most often feels comfortable.

Daylight stretches from about 15 hours at the start of August to 13 h 24 min by month's end. Set against the rest of the year, August is Mont-Saint-Aignan's 2nd-clearest and 12th-windiest month. For the whole year in context, see Mont-Saint-Aignan's year-round climate.

Daytime high
22°
2nd warmest
Overnight low
13°
12th coldest
Rainfall
65 mm
10.7 wet days
Daylight
14 h 12 min
5:53 AM – 8:07 PM
Cloud cover
63%
2nd clearest
Wind
12 km/h
12th windiest
Solar energy
4.69 kWh/m²
Travel score
6.6
out of 10

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 23°C in the first days to 21°C by the end.

A typical August day in Mont-Saint-Aignan reaches about 22°C in the afternoon and slips back to 13°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 18°C and 28°C. Set against its neighbours, August runs on par with July and about 3°C warmer than September.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12314
22314
32314
42314
52314
62314
72314
82314
92314
102314
112314
122314
132314
142314
152314
162314
172214
182213
192213
202213
212213
222213
232213
242213
252213
262213
272113
282113
292113
302112
312112

How August really feels in Mont-Saint-Aignan

Once humidity and wind are folded in, August averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
0
wind chill below the day's low

August sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Mont-Saint-Aignan weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 5th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 6311.80.98.40.8
Feb / 56111.29.81.1
Mar11° / 6011.50.411.52.6
Apr14° / 6311.30.213.43.9
May17° / 6612.1015.15.1
Jun20° / 12°65110166.0
Jul22° / 13°5910.9015.66.6
Aug22° / 13°6510.7014.26.6
Sep19° / 11°529.4012.46.1
Oct15° / 7312.3010.54.2
Nov10° / 6912.70.28.92.2
Dec / 8113.3181.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 20% of August, with mostly cloudy or overcast conditions the remaining 59%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14555
24555
34456
44357
54357
64357
74357
84258
94258
104357
114258
124258
134159
144159
154159
164159
174159
184060
193961
203961
213862
224060
233961
243961
253862
263862
273862
283862
293763
303763
313763

Chance of precipitation in August

Any precipitation

Mont-Saint-Aignan gets around 65 mm of rain over 10.7 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 34% and peaks near 36% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
235
336
436
536
636
736
836
936
1036
1136
1236
1336
1435
1535
1635
1735
1835
1935
2034
2134
2234
2333
2433
2532
2632
2731
2831
2930
3030
3129

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the comfortable band about 44% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
13051181
23150181
33150181
43150181
53250171
63250171
73349171
83349172
93448162
103448162
113547162
123547162
133646161
143746161
153745161
163845161
173845161
183844161
193944161
204043161
214143161
224242151
234441151
244540141
254739141
264838131
274937131
285037121
295236111
305335111
315435101

Wind in August

Winds average 12 km/h in August, the calmest month.

Across August, daily wind ranges from about 11 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
111calm
211calm
311calm
411calm
511calm
611calm
711calm
811calm
911calm
1011calm
1111calm
1212calm
1312calm
1412calm
1512calm
1612calm
1712calm
1812calm
1912calm
2012calm
2112calm
2212calm
2312calm
2412calm
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3112light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 15 hours at the start of August to 13 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 96 minutes over August. Sunrise moves from 5:31 AM to 6:15 AM, and sunset from 8:32 PM to 7:36 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.05:318:32
215.05:328:31
314.95:348:29
414.95:358:28
514.85:378:26
614.85:388:24
714.75:408:23
814.75:418:21
914.65:428:19
1014.65:448:18
1114.55:458:16
1214.55:478:14
1314.45:488:12
1414.35:508:11
1514.35:518:09
1614.25:538:07
1714.25:548:05
1814.15:568:03
1914.15:578:01
2014.05:597:59
2113.96:007:57
2213.96:027:55
2313.86:037:53
2413.86:057:51
2513.76:067:49
2613.76:087:47
2713.66:097:45
2813.56:117:43
2913.56:127:41
3013.46:147:38
3113.46:157:36

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.69 kWh/m².

For context, solar energy here swings from a low near 0.76 kWh/m² to a high of 5.69 kWh/m² in June across the year — August's 4.69 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.2Bright
45.1Bright
55.1Bright
65.1Bright
75.0Bright
85.0Bright
95.0Bright
104.9Bright
114.9Bright
124.9Bright
134.8Bright
144.8Bright
154.7Bright
164.7Bright
174.7Bright
184.6Bright
194.6Bright
204.5Bright
214.5Bright
224.4Bright
234.4Bright
244.3Bright
254.3Bright
264.3Bright
274.2Bright
284.2Bright
294.1Bright
304.1Bright
314.1Bright
Planning a trip in August

Is August a good time to visit Mont-Saint-Aignan?

Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.6
Sightseeing
1st-best month of the year
4.7
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Mont-Saint-Aignan for sightseeing.

What to pack for Mont-Saint-Aignan in August

From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In August, Mont-Saint-Aignan sees daytime highs around 22°C and nights near 13°C. Worth packing: light clothes, rain gear and sun protection. About 11 days see rain.

light clothesrain gearsun protection

Sea temperature near Mont-Saint-Aignan in August

The nearest coast averages about 18°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 48 km away) is warmest in August at about 18°C and coldest in February near 8°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan8Bracing
Feb8Bracing
Mar8Bracing
Apr10Bracing
May12Bracing
Jun15Bracing
Jul17Cool
Aug18Cool
Sep18Cool
Oct16Cool
Nov13Bracing
Dec10Bracing

UV index in Mont-Saint-Aignan in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Mont-Saint-Aignan peaks around June 18 at about 7 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 18UV 7Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr5Moderate
May6High
Jun7High
Jul6High
Aug7High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Mont-Saint-Aignan in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Mont-Saint-Aignan is worst in April — around 15 µg/m³ PM2.5 (moderate), about 1.7× the cleanest month (November, 9 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodApr 1215 µg/m³Nov 189 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb11Good
Mar14Moderate
Apr15Moderate
May13Moderate
Jun12Moderate
Jul10Good
Aug11Good
Sep11Good
Oct9Good
Nov9Good
Dec9Good
Location & terrain

Where is Mont-Saint-Aignan?

Mont-Saint-Aignan sits at 49.5°N, 1.1°E, 128 m above sea level, in France. The nearest listed city is Rouen, 2.0 km away.

Topography around Mont-Saint-Aignan

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Mont-Saint-Aignan.

Within 3 km, the terrain around Mont-Saint-Aignan has only modest variations in elevation — a maximum elevation change of 192 m around an average of 107 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 200 m; within 80 km, significant variations in elevation — a maximum elevation change of 276 m.

The land around Mont-Saint-Aignan is covered by trees (51%) and artificial surfaces (39%) within 3 km, trees (40%) and cropland (29%) within 16 km, and cropland (44%) and trees (22%) within 80 km.

3 km
192 m
16 km
200 m
80 km
276 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Rouen 2.0 km · Canteleu 6.0 km · Sotteville-lès-Rouen 6.0 km · Le Petit-Quevilly 6.0 km · Le Grand-Quevilly 8.0 km · Saint-Étienne-du-Rouvray 10 km · Elbeuf 21 km · Louviers 28 km

France travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 77% of US
price level, 2025
GDP per capita
$48,986
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.3
per 100k, 2023
Road deaths
5.1
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 539
Religion
Roman Catholic 47%none 33%Muslim 4%Protestant 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Mont-Saint-Aignan (49.4631°, 1.0936°, elevation 128 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).